What must be true about the lock and tag placed on disconnecting means according to safety regulations?

The requirement that each tag must prohibit unauthorized operation of the disconnecting means is a fundamental principle in electrical safety regulations. Tags serve an important role in ensuring that equipment remains de-energized and is not re-energized by unauthorized personnel while maintenance or servicing is occurring. Each tag acts as a cautionary mechanism, clearly communicating that tampering or operation of the disconnecting means is not allowed. This practice is crucial for preventing accidents and injuries that could occur if the equipment is accidentally powered while someone is working on it.

In contrast, other options suggest scenarios that do not align with safety regulations. For instance, not requiring locks or tags outside of business hours might imply a lapse in safety protocol, which could lead to dangerous situations. Stating that a tag alone is sufficient without a lock overlooks the importance of physically securing the equipment from being operated. Moreover, the notion that only a supervisor can remove the tags does not take into account the need for proper procedures and documentation for lockout/tagout practices. Each of these misinterpretations highlights why the necessity of tagging to prohibit unauthorized operation is paramount.